usb: fotg210-udc: Implement VBUS session
Implement VBUS session handling for FOTG210. This is mainly used by the UDC driver which needs to call down to the FOTG210 core and enable/disable VBUS, as this needs to be handled outside of the HCD and UDC drivers, by platform specific glue code. The Gemini has a special bit in a system register to turn VBUS on and off so we implement this in the FOTG210 core. Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Link: https://lore.kernel.org/r/20230103-gemini-fotg210-usb-v2-7-100388af9810@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -95,6 +95,35 @@ static int fotg210_gemini_init(struct fotg210 *fotg, struct resource *res,
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return 0;
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}
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/**
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* fotg210_vbus() - Called by gadget driver to enable/disable VBUS
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* @enable: true to enable VBUS, false to disable VBUS
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*/
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void fotg210_vbus(struct fotg210 *fotg, bool enable)
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{
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u32 mask;
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u32 val;
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int ret;
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switch (fotg->port) {
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case GEMINI_PORT_0:
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mask = GEMINI_MISC_USB0_VBUS_ON;
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val = enable ? GEMINI_MISC_USB0_VBUS_ON : 0;
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break;
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case GEMINI_PORT_1:
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mask = GEMINI_MISC_USB1_VBUS_ON;
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val = enable ? GEMINI_MISC_USB1_VBUS_ON : 0;
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break;
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default:
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return;
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}
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ret = regmap_update_bits(fotg->map, GEMINI_GLOBAL_MISC_CTRL, mask, val);
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if (ret)
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dev_err(fotg->dev, "failed to %s VBUS\n",
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enable ? "enable" : "disable");
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dev_info(fotg->dev, "%s: %s VBUS\n", __func__, enable ? "enable" : "disable");
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}
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static int fotg210_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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@ -1082,9 +1082,26 @@ static int fotg210_udc_stop(struct usb_gadget *g)
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return 0;
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}
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/**
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* fotg210_vbus_session - Called by external transceiver to enable/disable udc
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* @_gadget: usb gadget
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* @is_active: 0 if should disable UDC VBUS, 1 if should enable
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*
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* Returns 0
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*/
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static int fotg210_vbus_session(struct usb_gadget *g, int is_active)
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{
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struct fotg210_udc *fotg210 = gadget_to_fotg210(g);
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/* Call down to core integration layer to drive or disable VBUS */
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fotg210_vbus(fotg210->fotg, is_active);
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return 0;
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}
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static const struct usb_gadget_ops fotg210_gadget_ops = {
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.udc_start = fotg210_udc_start,
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.udc_stop = fotg210_udc_stop,
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.vbus_session = fotg210_vbus_session,
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};
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/**
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@ -17,6 +17,8 @@ struct fotg210 {
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enum gemini_port port;
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};
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void fotg210_vbus(struct fotg210 *fotg, bool enable);
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#ifdef CONFIG_USB_FOTG210_HCD
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int fotg210_hcd_probe(struct platform_device *pdev, struct fotg210 *fotg);
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int fotg210_hcd_remove(struct platform_device *pdev);
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